How Tough Is it to Build a Dirty Bomb?

Science correspondent Miles O’Brien examines the threat that radioactive “dirty bombs”could pose to cities in the U.S., and what’s being done to prevent a radiological attack from happening.

AIR DATE: Feb. 8, 2011

http://www.pbs.org/newshour/bb/science/jan-june11/dirtybombs_02-08.html